QAT mod

[tony.mon]

I wanted a quicker-action throttle, but not on-off, and so when I saw a reference to a little insert that increased the effective radius of the throttle cam in PB it seemed worth a closer inspection.
It turned out to be this:
http://www.bikersdiscountstore.co.uk/ha ... -pd-14.php
which is for Suzuki's and only a few models at that.
Also stupidly expensive for what it is.

So I though I'd have a go at making a Storm- applicable one.
It's easier than you'd think, I used a strip cut from the end of a film canister, trimmed to a suitable width and with the little tongues at the ends cut in using side cutters.

It's only about 1mm thick, so won't be as effective as the QS ones, which from their pics looks to be 2mm or so, but will decrease the angle of turn needed to fully open the throttle.
But as it's that simple I can give it a try and then either add a shim beneath part of the strip to make a variable action- i.e. slow at first for easy traffic/slow riding, then snapping open at bigger angles.

Or I could just make another one from thicker stock.

There appears to be no need to fix it to the throttle tube, as it will be held in place by the throttle housing and trapped by the cable, so it has nowhere to go.

Here's a picture of my bodged one:

You should be able to get the idea.

I'll fit it tomorrow and report how it works. I do love a good cheap bodge

[benny hedges]

more than happy with the 1/4 turn rc45 one on mine - £16 off silvers.
with an insert i'd be bothered about the return cable getting snagged.

[chi kung]

I would like to know how it turns out. I hate the massive throttle on my storm.

[benny hedges]

I would like to know how it turns out. I hate the massive throttle on my storm.

search quick action throttle on here and you will turn up a few threads.
i posted the part number from silvers but can't remember where lol.... if you cant find it here you will find it on superhawk.com
it's just the throttle tube you want, not the whole assembly, off an rc45 (rvf750) honda.
any honda dealer will get you one but i paid 16 off silvers with about 3.50 postage.

take all the slack out of the cables to fit it.
i found it easier to take off the right hand bar off the forks, or just undo it and twist it forward to give you more free play, then adjust it back up once it's on.
the difference isnt so drastic to make you flip it first time out but obviously be carefull til you get used to it lol.
full bore is 1/4 turn or 90 degrees rather than a fistfull & a bit with the standard pos.

*there yer go -

GRIP COMP.,R.

Make: Honda
OEM#: 53140-MR7-000
Product#: 53140MR7000

Price € 18.00

[tony.mon]

UPDATE:
Well, it's in and working just as I planned.
It cuts out the "two bites" opening that the standard one has, but with enough control to allow for riding in traffic.

I had to remove the airbox and loosen the cables from the lower end enough to mount it in place, so it's not quite just a case of undoing the two screws holding the housing together and slipping off the throttle tube from the clip-on, but even so I did it in less than two hours fiddling about, with stops for coffee.

I know I could have just gone out and bought another throttle tube, but I prefer to make my own solutions if I can- there's more to the bike that just store-bought bolt-ons that way.

So this mod's recommended, and although the additional spacer isn't firmly connected to the throttle tube it doesn't slip off, slide to one side or move about in any way, so it's safe enough to use without fear of a jammed-open throttle or similar.

Go on, have a go- you can easily take it out again if you don't like it, or make a thicker one if you want a more animal response.

[tony.mon]

Exactly.
It should be easy to make a second 1mm thickness glued part-way round the addition piece which will mean that it acts as a cam, the more you twist, the quicker it gets.
At a guess the "ramp" needs to start about 12-15mm in from where the small tongue slips into the cable aperture on the front (pull) side. You will be able to see what I mean by that once you pull it apart.

If you wanted to, it would be easy to permanently bond the addition piece(s) to the original throttle housing; glueing or welding with a soldering iron will both work, I would have thought.

[Jazzscot]

Any chance of a bigger picture Tony? and also of one in situ.

Cheers Jazz

[tony.mon]

The one I made is now installed, and it's a lot of faffing about to take it off, plus it's white plastic on white plastic, so wouldn't show much on my cheap camera.

But I can make another quite easily, and have a spare throttle tube, so at the weekend I'll do that and post piccies.
If I use black plastic for the additional piece this time it should show up a bit easier.

But basically it's a copy of the HairyRS QAT one in the link in my first post.
If you take off your throttle tube you can easily see what size it needs to be and how to cut the tongues to fit under the cables.

[Jazzscot]

Cheers Ton, I may have an attempt once I see your quality workmanship.

Jazz

[AMCQ46]

Tony,
Thanks for the idea

I just copied your suggestion as it looked like a nice simple mod, and I had the airbox & Carbs off already to do the front valve clearances, so would have been daft not to do it when most of the extra effort you had to do to fit yours was already done.

My film canister [there must be some on here who dont know what they are ] was 0.9mm thick, so it will not be a dramatic change in ratio, but it is a step in the correct direction. Is now obviously less that 1/4 turn to fully open, but I didnt check what it was before.

I used a bit of hot melt to hold it in place from 4 till 8 on the clock face [with the cable ends at 12 noon], it made it easier to assemble, and also added a bit more thickness after 1/2 throttle.

Great free mod

[tony.mon]

Good one, it's such a simple thing I'm kicking myself for not coming up with this years ago.

I'd been thinking about the variable cam version, and the only hiccup is that it would move the "pull" side cable more than the "push" side, and so you'd need to make sure that there was a little more slack on the cable to allow for the increased diameter at the fatter part of the insert increasing the effective diameter and taking up all of the cable slack.
I suppose if you were a perfectionist you could also vary the lower cable wheel, at the lower end of the cable runs, on the side of the carb. If you had a cam at the top you'd need a corresponding cam at the bottom to keep the same cable slack, so be careful that it doesn't bind due to being overtight when fully open.

But it may be that the difference in cable length is small enough so that you wouldn't notice.
No problem with a constant thickness insert, though.

[benny hedges]

er...... another update....

it works even better with an rc45 throttle lol
just done mine and took it out for a quick test = MENTAL

will take a while to get used to lol

to get the right size diameter i found an o-ring set box and it has a nice selection of different sized circles.
took 2 attempts to get the right one and almost sawn through my hand tring to cut it!
fits perfectly with just 1/2mm clearance either side so the cable doesnt get stuck.

there's virtually no play at all in the throttle cables now but so far i like it - cheers toe

[benny hedges]

1mm nylon cap, 30mm diameter


cut the end off


trim to fit throttle housing & smooth edges off


split the circle, slide under cables and pack with grease - didnt need to take the throttle off or cables


& just in case i forget lol


if i flip my bike it's your fault tony!

[AMCQ46]

Did you test the throttle returns when on full lock?

I did same mod on mine, then adjusted till almost no slack, but on full right lock the throttle was very slow to close. Tried re routing cables and everything, but only solution was to put some slack back into the cable in straight ahead position.

Don't want you to have throttle hang open when you turn bike round

[benny hedges]

yeh its sound bud, snaps back just the same as before on left & right lock.
i think it helped working ptfe grease through the cables as well, and i re routed the choke cables under the carbs cos the front one was rubbing on the throttle cam which i didnt like...

will give it a proper test tomorrow - bike sounds nice again now!